RegisterRequiresViewStateEncryption()

Question

Boa tarde, 

   Ao executar uma pagina que contem um gridview dentro de um formview aparece o seguinte erro: Tem como me ajudarem? Obrigado.

The RegisterRequiresViewStateEncryption() method needs to be called before or during Page_PreRender.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.InvalidOperationException: The RegisterRequiresViewStateEncryption() method needs to be called before or during Page_PreRender.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 

[InvalidOperationException: The RegisterRequiresViewStateEncryption() method needs to be called before or during Page_PreRender.] System.Web.UI.Page.RegisterRequiresViewStateEncryption() +97 System.Web.UI.WebControls.GridView.OnInit(EventArgs e) +124 System.Web.UI.Control.InitRecursive(Control namingContainer) +569 System.Web.UI.Control.InitRecursive(Control namingContainer) +302 System.Web.UI.Control.AddedControl(Control control, Int32 index) +395 System.Web.UI.ControlCollection.Add(Control child) +358 System.Web.UI.WebControls.CellControlCollection.Add(Control child) +58 System.Web.UI.ControlCollection.AddAt(Int32 index, Control child) +50 System.Web.UI.WebControls.CellControlCollection.AddAt(Int32 index, Control child) +61 System.Web.UI.WebControls.TableCellCollection.AddAt(Int32 index, TableCell cell) +59 System.Web.UI.WebControls.TableCellCollection.Add(TableCell cell) +40 System.Web.UI.WebControls.FormView.InitializeRow(FormViewRow row) +591 System.Web.UI.WebControls.FormView.CreateRow(Int32 itemIndex, DataControlRowType rowType, DataControlRowState rowState, TableRowCollection rows, PagedDataSource pagedDataSource) +132 System.Web.UI.WebControls.FormView.CreateDataRowFromTemplates(Boolean dataBinding, TableRowCollection rows) +144 System.Web.UI.WebControls.FormView.CreateDataRow(Boolean dataBinding, TableRowCollection rows, Object dataItem) +151 System.Web.UI.WebControls.FormView.CreateChildControls(IEnumerable dataSource, Boolean dataBinding) +2910 System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data) +101 System.Web.UI.WebControls.FormView.PerformDataBinding(IEnumerable data) +36 System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) +197 System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +114 System.Web.UI.WebControls.DataBoundControl.PerformSelect() +225 System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +127 System.Web.UI.WebControls.FormView.DataBind() +28 System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +108 System.Web.UI.WebControls.FormView.EnsureDataBound() +254 System.Web.UI.WebControls.CompositeDataBoundControl.CreateChildControls() +130 System.Web.UI.Control.EnsureChildControls() +162 System.Web.UI.Control.FindControl(String id, Int32 pathOffset) +66 System.Web.UI.Control.FindControl(String id) +41 Telerik.Web.ChildControlHelper.FindControlRecursive(String ID, Control root) +248 Telerik.Web.ChildControlHelper.FindControlRecursive(String ID, Control root) +318 Telerik.Web.ChildControlHelper.FindControlRecursive(String ID, Control root) +318 Telerik.Web.ChildControlHelper.FindControlRecursive(String ID, Control root) +318 Telerik.Web.ChildControlHelper.FindControlRecursive(String ID, Control root) +318 Telerik.Web.ChildControlHelper.FindControlRecursive(String ID, Control root) +318 Telerik.Web.ChildControlHelper.FindControlRecursive(String ID, Control root) +318 Telerik.Web.ChildControlHelper.FindControlRecursive(String ID, Control root) +318 Telerik.Web.ChildControlHelper.FindControlRecursive(String ID, Control root) +318 Telerik.Web.ChildControlHelper.FindControlRecursive(Control searcher, String ID) +362 Telerik.Web.UI.RadAjaxControl.FindControlRecursive(String ID) +37 Telerik.Web.UI.RadAjaxManager.ResolveClientID(String ID) +73 Telerik.Web.UI.AjaxSetting.SerializeToJavascript(RadAjaxManager manager) +121 Telerik.Web.UI.AjaxSettingsCollection.SerializeToJavascript(RadAjaxManager manager) +242 Telerik.Web.UI.RadAjaxManager.GetScriptDescriptors() +187 System.Web.UI.ScriptControlManager.RegisterScriptDescriptors(IScriptControl scriptControl) +511 System.Web.UI.ScriptManager.RegisterScriptDescriptors(IScriptControl scriptControl) +50 Telerik.Web.UI.RadAjaxManager.Render(HtmlTextWriter writer) +219 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +94 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +343 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +63 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +269 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +54 System.Web.UI.Control.Render(HtmlTextWriter writer) +39 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +94 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +343 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +63 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +269 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +54 System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +286 System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +52 System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +378 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +94 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +343 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +63 System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +69 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +269 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +54 System.Web.UI.Control.Render(HtmlTextWriter writer) +39 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +94 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +343 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +63 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +269 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +54 System.Web.UI.Control.Render(HtmlTextWriter writer) +39 System.Web.UI.Page.Render(HtmlTextWriter writer) +49 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +94 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +343 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +63 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6008

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Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272